在 Android 中从包裹中解压自定义数据类型时出错答案

【问题标题】：Error with unpacking a Custom Data Type from a Parcel in Android在 Android 中从包裹中解压自定义数据类型时出错
【发布时间】：2015-06-03 20:38:06
【问题描述】：

在将自定义数据类型的数组写入包裹后，我遇到了重新创建数组的问题。

playerwear 是这样声明的：

private Wearable playerWear[] = new Wearable[5];

这是将它写入父类中的包裹的行。它是一个具有 5 个元素的 Wearable 类型的数组

        parcel.writeArray(playerWear);

这是从 Parcel 读取它的行（temp 是父级的空数据元素，所有元素都以与下面相同的方式填充。所有其他元素都在工作）

        temp.playerWear = (Wearable[])source.readArray(Wearable.class.getClassLoader());

这是在可穿戴数据类型中定义的 Parcel 接口的代码：

    @Override
public int describeContents()
{
    return 0;
}

/**
 * This is the main method of the Parcelable Interface.  This packs everything
 * up into the parcel that will be used in the next activity
 * @param parcel the parcel that will be passed to the next activity
 * @param i used to keep track of the size...I think
 */
@Override
public void writeToParcel(Parcel parcel, int i)
{
    parcel.writeString(slotName);
    parcel.writeParcelable(heldItem, i);
    if (holdingItem)
        parcel.writeString("True");
    else
        parcel.writeString("False");
}

/**
 * This is the method that takes the passed parcel and rebuilds it so that it can be used
 * @param source the passed parcel
 * @return the reconstructed data type
 */
public static Wearable recreateParcel(Parcel source)
{
    Wearable temp = new Wearable();
    temp.slotName = source.readString();
    temp.heldItem = (Item) source.readParcelable(Item.class.getClassLoader());
    String bool = source.readString();
    if(bool.equals("True"))
        temp.holdingItem = true;
    else
        temp.holdingItem = false;

    return temp;
}

/**
 * Not truly sure what this is but I think this is similar to the classLoader
 */
public static final Parcelable.Creator CREATOR = new Parcelable.Creator()
{
    /**
     * Calls the method that I created to recreate the Data type
     * @param in the passed parcel
     * @return s the return of the recreateParcel method
     */
    public Wearable createFromParcel(Parcel in)
    {
        return recreateParcel(in);
    }

    /**
     * Called if the custom data type is in an array
     * @param size the size of the array. Used to figure out how many elements are needed
     * @return an Array of the Data type
     */
    public Wearable[] newArray(int size)
    {
        return new Wearable[size];
    }
};

最后这是它给我的错误，

原因：java.lang.ClassCastException：java.lang.Object[] 无法转换为 com.rtbd.storytime.Wearable[]

如果我忘记了解决此问题所需的任何重要信息，请发布。

谢谢！

【问题讨论】：

标签： android classcastexception parcelable parcel

【解决方案1】：

经过大量研究后，我在以下位置找到了答案： Read & writing arrays of Parcelable objects

你不想写成parcelableArray或者Array你想写成TypedArray然后在createTypedArray方法中调用数据类型的CREATOR。

【讨论】：